| 1 |
A single chloride free radical can destroy how many ozone molecules |
- A. 100
- B. 100,000
- C. 100,00
- D. unlimited
|
| 2 |
The minimum temperature of troposphere is. |
- A. -2<sup>o</sup>C
- B. -56<sup>o</sup>C
- C. -100<sup>o</sup>C
- D. 15<sup>o</sup>C
|
| 3 |
The pH of unpolluted rain water should be |
- A. 5.00
- B. 5.60
- C. 6.50
- D. 7.00
|
| 4 |
The pH range of the acid rain is. |
- A. 7-6.5
- B. 6.5-6
- C. 6-6.5
- D. Less than 5
|
| 5 |
Which one of the followings is not a pollutant. |
- A. CO2
- B. NO2
- C. CO
- D. SO2
|
| 6 |
In purification of potable water the coagulant used is |
- A. Nickel sulphate
- B. Copper sulphate
- C. Barium sulphate
- D. Alum
|
| 7 |
The region of earth capable of supposing life is called. |
- A. Atmosphere
- B. Bisphere
- C. Dithosphere
- D. Hydrosphere
|
| 8 |
Water is disinfected by a substance to avoid toxification |
- A. KMnO<sub>4</sub>
- B. Alums
- C. O<sub>3</sub>
- D. Cl<sub>2</sub>
|
| 9 |
Ecosystem is smaller units of. |
- A. Lithosphere
- B. Hydrosphere
- C. Atmosphere
- D. Biosphere
|
| 10 |
How much fresh water is used for domestic purpose |
- A. 8%
- B. 23%
- C. 69%
- D. 100%
|